Remove unused Bullet module and thirdparty code

It has been disabled in `master` since one year (#45852) and our plan
is for Bullet, and possibly other thirdparty physics engines, to be
implemented via GDExtension so that they can be selected by the users
who need them.

1 files changed, 0 insertions, 975 deletions

diff --git a/thirdparty/bullet/BulletDynamics/ConstraintSolver/btGeneric6DofConstraint.cpp b/thirdparty/bullet/BulletDynamics/ConstraintSolver/btGeneric6DofConstraint.cpp
deleted file mode 100644
index 1f54203532..0000000000
--- a/thirdparty/bullet/BulletDynamics/ConstraintSolver/btGeneric6DofConstraint.cpp
+++ /dev/null
@@ -1,975 +0,0 @@
-/*
-Bullet Continuous Collision Detection and Physics Library
-Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
-
-This software is provided 'as-is', without any express or implied warranty.
-In no event will the authors be held liable for any damages arising from the use of this software.
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it freely,
-subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-*/
-/*
-2007-09-09
-Refactored by Francisco Le?n
-email: projectileman@yahoo.com
-http://gimpact.sf.net
-*/
-
-#include "btGeneric6DofConstraint.h"
-#include "BulletDynamics/Dynamics/btRigidBody.h"
-#include "LinearMath/btTransformUtil.h"
-#include "LinearMath/btTransformUtil.h"
-#include <new>
-
-#define D6_USE_OBSOLETE_METHOD false
-#define D6_USE_FRAME_OFFSET true
-
-btGeneric6DofConstraint::btGeneric6DofConstraint(btRigidBody& rbA, btRigidBody& rbB, const btTransform& frameInA, const btTransform& frameInB, bool useLinearReferenceFrameA)
-	: btTypedConstraint(D6_CONSTRAINT_TYPE, rbA, rbB), m_frameInA(frameInA), m_frameInB(frameInB), m_useLinearReferenceFrameA(useLinearReferenceFrameA), m_useOffsetForConstraintFrame(D6_USE_FRAME_OFFSET), m_flags(0), m_useSolveConstraintObsolete(D6_USE_OBSOLETE_METHOD)
-{
-	calculateTransforms();
-}
-
-btGeneric6DofConstraint::btGeneric6DofConstraint(btRigidBody& rbB, const btTransform& frameInB, bool useLinearReferenceFrameB)
-	: btTypedConstraint(D6_CONSTRAINT_TYPE, getFixedBody(), rbB),
-	  m_frameInB(frameInB),
-	  m_useLinearReferenceFrameA(useLinearReferenceFrameB),
-	  m_useOffsetForConstraintFrame(D6_USE_FRAME_OFFSET),
-	  m_flags(0),
-	  m_useSolveConstraintObsolete(false)
-{
-	///not providing rigidbody A means implicitly using worldspace for body A
-	m_frameInA = rbB.getCenterOfMassTransform() * m_frameInB;
-	calculateTransforms();
-}
-
-#define GENERIC_D6_DISABLE_WARMSTARTING 1
-
-btScalar btGetMatrixElem(const btMatrix3x3& mat, int index);
-btScalar btGetMatrixElem(const btMatrix3x3& mat, int index)
-{
-	int i = index % 3;
-	int j = index / 3;
-	return mat[i][j];
-}
-
-///MatrixToEulerXYZ from http://www.geometrictools.com/LibFoundation/Mathematics/Wm4Matrix3.inl.html
-bool matrixToEulerXYZ(const btMatrix3x3& mat, btVector3& xyz);
-bool matrixToEulerXYZ(const btMatrix3x3& mat, btVector3& xyz)
-{
-	//	// rot =  cy*cz          -cy*sz           sy
-	//	//        cz*sx*sy+cx*sz  cx*cz-sx*sy*sz -cy*sx
-	//	//       -cx*cz*sy+sx*sz  cz*sx+cx*sy*sz  cx*cy
-	//
-
-	btScalar fi = btGetMatrixElem(mat, 2);
-	if (fi < btScalar(1.0f))
-	{
-		if (fi > btScalar(-1.0f))
-		{
-			xyz[0] = btAtan2(-btGetMatrixElem(mat, 5), btGetMatrixElem(mat, 8));
-			xyz[1] = btAsin(btGetMatrixElem(mat, 2));
-			xyz[2] = btAtan2(-btGetMatrixElem(mat, 1), btGetMatrixElem(mat, 0));
-			return true;
-		}
-		else
-		{
-			// WARNING.  Not unique.  XA - ZA = -atan2(r10,r11)
-			xyz[0] = -btAtan2(btGetMatrixElem(mat, 3), btGetMatrixElem(mat, 4));
-			xyz[1] = -SIMD_HALF_PI;
-			xyz[2] = btScalar(0.0);
-			return false;
-		}
-	}
-	else
-	{
-		// WARNING.  Not unique.  XAngle + ZAngle = atan2(r10,r11)
-		xyz[0] = btAtan2(btGetMatrixElem(mat, 3), btGetMatrixElem(mat, 4));
-		xyz[1] = SIMD_HALF_PI;
-		xyz[2] = 0.0;
-	}
-	return false;
-}
-
-//////////////////////////// btRotationalLimitMotor ////////////////////////////////////
-
-int btRotationalLimitMotor::testLimitValue(btScalar test_value)
-{
-	if (m_loLimit > m_hiLimit)
-	{
-		m_currentLimit = 0;  //Free from violation
-		return 0;
-	}
-	if (test_value < m_loLimit)
-	{
-		m_currentLimit = 1;  //low limit violation
-		m_currentLimitError = test_value - m_loLimit;
-		if (m_currentLimitError > SIMD_PI)
-			m_currentLimitError -= SIMD_2_PI;
-		else if (m_currentLimitError < -SIMD_PI)
-			m_currentLimitError += SIMD_2_PI;
-		return 1;
-	}
-	else if (test_value > m_hiLimit)
-	{
-		m_currentLimit = 2;  //High limit violation
-		m_currentLimitError = test_value - m_hiLimit;
-		if (m_currentLimitError > SIMD_PI)
-			m_currentLimitError -= SIMD_2_PI;
-		else if (m_currentLimitError < -SIMD_PI)
-			m_currentLimitError += SIMD_2_PI;
-		return 2;
-	};
-
-	m_currentLimit = 0;  //Free from violation
-	return 0;
-}
-
-btScalar btRotationalLimitMotor::solveAngularLimits(
-	btScalar timeStep, btVector3& axis, btScalar jacDiagABInv,
-	btRigidBody* body0, btRigidBody* body1)
-{
-	if (needApplyTorques() == false) return 0.0f;
-
-	btScalar target_velocity = m_targetVelocity;
-	btScalar maxMotorForce = m_maxMotorForce;
-
-	//current error correction
-	if (m_currentLimit != 0)
-	{
-		target_velocity = -m_stopERP * m_currentLimitError / (timeStep);
-		maxMotorForce = m_maxLimitForce;
-	}
-
-	maxMotorForce *= timeStep;
-
-	// current velocity difference
-
-	btVector3 angVelA = body0->getAngularVelocity();
-	btVector3 angVelB = body1->getAngularVelocity();
-
-	btVector3 vel_diff;
-	vel_diff = angVelA - angVelB;
-
-	btScalar rel_vel = axis.dot(vel_diff);
-
-	// correction velocity
-	btScalar motor_relvel = m_limitSoftness * (target_velocity - m_damping * rel_vel);
-
-	if (motor_relvel < SIMD_EPSILON && motor_relvel > -SIMD_EPSILON)
-	{
-		return 0.0f;  //no need for applying force
-	}
-
-	// correction impulse
-	btScalar unclippedMotorImpulse = (1 + m_bounce) * motor_relvel * jacDiagABInv;
-
-	// clip correction impulse
-	btScalar clippedMotorImpulse;
-
-	///@todo: should clip against accumulated impulse
-	if (unclippedMotorImpulse > 0.0f)
-	{
-		clippedMotorImpulse = unclippedMotorImpulse > maxMotorForce ? maxMotorForce : unclippedMotorImpulse;
-	}
-	else
-	{
-		clippedMotorImpulse = unclippedMotorImpulse < -maxMotorForce ? -maxMotorForce : unclippedMotorImpulse;
-	}
-
-	// sort with accumulated impulses
-	btScalar lo = btScalar(-BT_LARGE_FLOAT);
-	btScalar hi = btScalar(BT_LARGE_FLOAT);
-
-	btScalar oldaccumImpulse = m_accumulatedImpulse;
-	btScalar sum = oldaccumImpulse + clippedMotorImpulse;
-	m_accumulatedImpulse = sum > hi ? btScalar(0.) : sum < lo ? btScalar(0.) : sum;
-
-	clippedMotorImpulse = m_accumulatedImpulse - oldaccumImpulse;
-
-	btVector3 motorImp = clippedMotorImpulse * axis;
-
-	body0->applyTorqueImpulse(motorImp);
-	body1->applyTorqueImpulse(-motorImp);
-
-	return clippedMotorImpulse;
-}
-
-//////////////////////////// End btRotationalLimitMotor ////////////////////////////////////
-
-//////////////////////////// btTranslationalLimitMotor ////////////////////////////////////
-
-int btTranslationalLimitMotor::testLimitValue(int limitIndex, btScalar test_value)
-{
-	btScalar loLimit = m_lowerLimit[limitIndex];
-	btScalar hiLimit = m_upperLimit[limitIndex];
-	if (loLimit > hiLimit)
-	{
-		m_currentLimit[limitIndex] = 0;  //Free from violation
-		m_currentLimitError[limitIndex] = btScalar(0.f);
-		return 0;
-	}
-
-	if (test_value < loLimit)
-	{
-		m_currentLimit[limitIndex] = 2;  //low limit violation
-		m_currentLimitError[limitIndex] = test_value - loLimit;
-		return 2;
-	}
-	else if (test_value > hiLimit)
-	{
-		m_currentLimit[limitIndex] = 1;  //High limit violation
-		m_currentLimitError[limitIndex] = test_value - hiLimit;
-		return 1;
-	};
-
-	m_currentLimit[limitIndex] = 0;  //Free from violation
-	m_currentLimitError[limitIndex] = btScalar(0.f);
-	return 0;
-}
-
-btScalar btTranslationalLimitMotor::solveLinearAxis(
-	btScalar timeStep,
-	btScalar jacDiagABInv,
-	btRigidBody& body1, const btVector3& pointInA,
-	btRigidBody& body2, const btVector3& pointInB,
-	int limit_index,
-	const btVector3& axis_normal_on_a,
-	const btVector3& anchorPos)
-{
-	///find relative velocity
-	//    btVector3 rel_pos1 = pointInA - body1.getCenterOfMassPosition();
-	//    btVector3 rel_pos2 = pointInB - body2.getCenterOfMassPosition();
-	btVector3 rel_pos1 = anchorPos - body1.getCenterOfMassPosition();
-	btVector3 rel_pos2 = anchorPos - body2.getCenterOfMassPosition();
-
-	btVector3 vel1 = body1.getVelocityInLocalPoint(rel_pos1);
-	btVector3 vel2 = body2.getVelocityInLocalPoint(rel_pos2);
-	btVector3 vel = vel1 - vel2;
-
-	btScalar rel_vel = axis_normal_on_a.dot(vel);
-
-	/// apply displacement correction
-
-	//positional error (zeroth order error)
-	btScalar depth = -(pointInA - pointInB).dot(axis_normal_on_a);
-	btScalar lo = btScalar(-BT_LARGE_FLOAT);
-	btScalar hi = btScalar(BT_LARGE_FLOAT);
-
-	btScalar minLimit = m_lowerLimit[limit_index];
-	btScalar maxLimit = m_upperLimit[limit_index];
-
-	//handle the limits
-	if (minLimit < maxLimit)
-	{
-		{
-			if (depth > maxLimit)
-			{
-				depth -= maxLimit;
-				lo = btScalar(0.);
-			}
-			else
-			{
-				if (depth < minLimit)
-				{
-					depth -= minLimit;
-					hi = btScalar(0.);
-				}
-				else
-				{
-					return 0.0f;
-				}
-			}
-		}
-	}
-
-	btScalar normalImpulse = m_limitSoftness * (m_restitution * depth / timeStep - m_damping * rel_vel) * jacDiagABInv;
-
-	btScalar oldNormalImpulse = m_accumulatedImpulse[limit_index];
-	btScalar sum = oldNormalImpulse + normalImpulse;
-	m_accumulatedImpulse[limit_index] = sum > hi ? btScalar(0.) : sum < lo ? btScalar(0.) : sum;
-	normalImpulse = m_accumulatedImpulse[limit_index] - oldNormalImpulse;
-
-	btVector3 impulse_vector = axis_normal_on_a * normalImpulse;
-	body1.applyImpulse(impulse_vector, rel_pos1);
-	body2.applyImpulse(-impulse_vector, rel_pos2);
-
-	return normalImpulse;
-}
-
-//////////////////////////// btTranslationalLimitMotor ////////////////////////////////////
-
-void btGeneric6DofConstraint::calculateAngleInfo()
-{
-	btMatrix3x3 relative_frame = m_calculatedTransformA.getBasis().inverse() * m_calculatedTransformB.getBasis();
-	matrixToEulerXYZ(relative_frame, m_calculatedAxisAngleDiff);
-	// in euler angle mode we do not actually constrain the angular velocity
-	// along the axes axis[0] and axis[2] (although we do use axis[1]) :
-	//
-	//    to get			constrain w2-w1 along		...not
-	//    ------			---------------------		------
-	//    d(angle[0])/dt = 0	ax[1] x ax[2]			ax[0]
-	//    d(angle[1])/dt = 0	ax[1]
-	//    d(angle[2])/dt = 0	ax[0] x ax[1]			ax[2]
-	//
-	// constraining w2-w1 along an axis 'a' means that a'*(w2-w1)=0.
-	// to prove the result for angle[0], write the expression for angle[0] from
-	// GetInfo1 then take the derivative. to prove this for angle[2] it is
-	// easier to take the euler rate expression for d(angle[2])/dt with respect
-	// to the components of w and set that to 0.
-	btVector3 axis0 = m_calculatedTransformB.getBasis().getColumn(0);
-	btVector3 axis2 = m_calculatedTransformA.getBasis().getColumn(2);
-
-	m_calculatedAxis[1] = axis2.cross(axis0);
-	m_calculatedAxis[0] = m_calculatedAxis[1].cross(axis2);
-	m_calculatedAxis[2] = axis0.cross(m_calculatedAxis[1]);
-
-	m_calculatedAxis[0].normalize();
-	m_calculatedAxis[1].normalize();
-	m_calculatedAxis[2].normalize();
-}
-
-void btGeneric6DofConstraint::calculateTransforms()
-{
-	calculateTransforms(m_rbA.getCenterOfMassTransform(), m_rbB.getCenterOfMassTransform());
-}
-
-void btGeneric6DofConstraint::calculateTransforms(const btTransform& transA, const btTransform& transB)
-{
-	m_calculatedTransformA = transA * m_frameInA;
-	m_calculatedTransformB = transB * m_frameInB;
-	calculateLinearInfo();
-	calculateAngleInfo();
-	if (m_useOffsetForConstraintFrame)
-	{  //  get weight factors depending on masses
-		btScalar miA = getRigidBodyA().getInvMass();
-		btScalar miB = getRigidBodyB().getInvMass();
-		m_hasStaticBody = (miA < SIMD_EPSILON) || (miB < SIMD_EPSILON);
-		btScalar miS = miA + miB;
-		if (miS > btScalar(0.f))
-		{
-			m_factA = miB / miS;
-		}
-		else
-		{
-			m_factA = btScalar(0.5f);
-		}
-		m_factB = btScalar(1.0f) - m_factA;
-	}
-}
-
-void btGeneric6DofConstraint::buildLinearJacobian(
-	btJacobianEntry& jacLinear, const btVector3& normalWorld,
-	const btVector3& pivotAInW, const btVector3& pivotBInW)
-{
-	new (&jacLinear) btJacobianEntry(
-		m_rbA.getCenterOfMassTransform().getBasis().transpose(),
-		m_rbB.getCenterOfMassTransform().getBasis().transpose(),
-		pivotAInW - m_rbA.getCenterOfMassPosition(),
-		pivotBInW - m_rbB.getCenterOfMassPosition(),
-		normalWorld,
-		m_rbA.getInvInertiaDiagLocal(),
-		m_rbA.getInvMass(),
-		m_rbB.getInvInertiaDiagLocal(),
-		m_rbB.getInvMass());
-}
-
-void btGeneric6DofConstraint::buildAngularJacobian(
-	btJacobianEntry& jacAngular, const btVector3& jointAxisW)
-{
-	new (&jacAngular) btJacobianEntry(jointAxisW,
-									  m_rbA.getCenterOfMassTransform().getBasis().transpose(),
-									  m_rbB.getCenterOfMassTransform().getBasis().transpose(),
-									  m_rbA.getInvInertiaDiagLocal(),
-									  m_rbB.getInvInertiaDiagLocal());
-}
-
-bool btGeneric6DofConstraint::testAngularLimitMotor(int axis_index)
-{
-	btScalar angle = m_calculatedAxisAngleDiff[axis_index];
-	angle = btAdjustAngleToLimits(angle, m_angularLimits[axis_index].m_loLimit, m_angularLimits[axis_index].m_hiLimit);
-	m_angularLimits[axis_index].m_currentPosition = angle;
-	//test limits
-	m_angularLimits[axis_index].testLimitValue(angle);
-	return m_angularLimits[axis_index].needApplyTorques();
-}
-
-void btGeneric6DofConstraint::buildJacobian()
-{
-#ifndef __SPU__
-	if (m_useSolveConstraintObsolete)
-	{
-		// Clear accumulated impulses for the next simulation step
-		m_linearLimits.m_accumulatedImpulse.setValue(btScalar(0.), btScalar(0.), btScalar(0.));
-		int i;
-		for (i = 0; i < 3; i++)
-		{
-			m_angularLimits[i].m_accumulatedImpulse = btScalar(0.);
-		}
-		//calculates transform
-		calculateTransforms(m_rbA.getCenterOfMassTransform(), m_rbB.getCenterOfMassTransform());
-
-		//  const btVector3& pivotAInW = m_calculatedTransformA.getOrigin();
-		//  const btVector3& pivotBInW = m_calculatedTransformB.getOrigin();
-		calcAnchorPos();
-		btVector3 pivotAInW = m_AnchorPos;
-		btVector3 pivotBInW = m_AnchorPos;
-
-		// not used here
-		//    btVector3 rel_pos1 = pivotAInW - m_rbA.getCenterOfMassPosition();
-		//    btVector3 rel_pos2 = pivotBInW - m_rbB.getCenterOfMassPosition();
-
-		btVector3 normalWorld;
-		//linear part
-		for (i = 0; i < 3; i++)
-		{
-			if (m_linearLimits.isLimited(i))
-			{
-				if (m_useLinearReferenceFrameA)
-					normalWorld = m_calculatedTransformA.getBasis().getColumn(i);
-				else
-					normalWorld = m_calculatedTransformB.getBasis().getColumn(i);
-
-				buildLinearJacobian(
-					m_jacLinear[i], normalWorld,
-					pivotAInW, pivotBInW);
-			}
-		}
-
-		// angular part
-		for (i = 0; i < 3; i++)
-		{
-			//calculates error angle
-			if (testAngularLimitMotor(i))
-			{
-				normalWorld = this->getAxis(i);
-				// Create angular atom
-				buildAngularJacobian(m_jacAng[i], normalWorld);
-			}
-		}
-	}
-#endif  //__SPU__
-}
-
-void btGeneric6DofConstraint::getInfo1(btConstraintInfo1* info)
-{
-	if (m_useSolveConstraintObsolete)
-	{
-		info->m_numConstraintRows = 0;
-		info->nub = 0;
-	}
-	else
-	{
-		//prepare constraint
-		calculateTransforms(m_rbA.getCenterOfMassTransform(), m_rbB.getCenterOfMassTransform());
-		info->m_numConstraintRows = 0;
-		info->nub = 6;
-		int i;
-		//test linear limits
-		for (i = 0; i < 3; i++)
-		{
-			if (m_linearLimits.needApplyForce(i))
-			{
-				info->m_numConstraintRows++;
-				info->nub--;
-			}
-		}
-		//test angular limits
-		for (i = 0; i < 3; i++)
-		{
-			if (testAngularLimitMotor(i))
-			{
-				info->m_numConstraintRows++;
-				info->nub--;
-			}
-		}
-	}
-}
-
-void btGeneric6DofConstraint::getInfo1NonVirtual(btConstraintInfo1* info)
-{
-	if (m_useSolveConstraintObsolete)
-	{
-		info->m_numConstraintRows = 0;
-		info->nub = 0;
-	}
-	else
-	{
-		//pre-allocate all 6
-		info->m_numConstraintRows = 6;
-		info->nub = 0;
-	}
-}
-
-void btGeneric6DofConstraint::getInfo2(btConstraintInfo2* info)
-{
-	btAssert(!m_useSolveConstraintObsolete);
-
-	const btTransform& transA = m_rbA.getCenterOfMassTransform();
-	const btTransform& transB = m_rbB.getCenterOfMassTransform();
-	const btVector3& linVelA = m_rbA.getLinearVelocity();
-	const btVector3& linVelB = m_rbB.getLinearVelocity();
-	const btVector3& angVelA = m_rbA.getAngularVelocity();
-	const btVector3& angVelB = m_rbB.getAngularVelocity();
-
-	if (m_useOffsetForConstraintFrame)
-	{  // for stability better to solve angular limits first
-		int row = setAngularLimits(info, 0, transA, transB, linVelA, linVelB, angVelA, angVelB);
-		setLinearLimits(info, row, transA, transB, linVelA, linVelB, angVelA, angVelB);
-	}
-	else
-	{  // leave old version for compatibility
-		int row = setLinearLimits(info, 0, transA, transB, linVelA, linVelB, angVelA, angVelB);
-		setAngularLimits(info, row, transA, transB, linVelA, linVelB, angVelA, angVelB);
-	}
-}
-
-void btGeneric6DofConstraint::getInfo2NonVirtual(btConstraintInfo2* info, const btTransform& transA, const btTransform& transB, const btVector3& linVelA, const btVector3& linVelB, const btVector3& angVelA, const btVector3& angVelB)
-{
-	btAssert(!m_useSolveConstraintObsolete);
-	//prepare constraint
-	calculateTransforms(transA, transB);
-
-	int i;
-	for (i = 0; i < 3; i++)
-	{
-		testAngularLimitMotor(i);
-	}
-
-	if (m_useOffsetForConstraintFrame)
-	{  // for stability better to solve angular limits first
-		int row = setAngularLimits(info, 0, transA, transB, linVelA, linVelB, angVelA, angVelB);
-		setLinearLimits(info, row, transA, transB, linVelA, linVelB, angVelA, angVelB);
-	}
-	else
-	{  // leave old version for compatibility
-		int row = setLinearLimits(info, 0, transA, transB, linVelA, linVelB, angVelA, angVelB);
-		setAngularLimits(info, row, transA, transB, linVelA, linVelB, angVelA, angVelB);
-	}
-}
-
-int btGeneric6DofConstraint::setLinearLimits(btConstraintInfo2* info, int row, const btTransform& transA, const btTransform& transB, const btVector3& linVelA, const btVector3& linVelB, const btVector3& angVelA, const btVector3& angVelB)
-{
-	//	int row = 0;
-	//solve linear limits
-	btRotationalLimitMotor limot;
-	for (int i = 0; i < 3; i++)
-	{
-		if (m_linearLimits.needApplyForce(i))
-		{  // re-use rotational motor code
-			limot.m_bounce = btScalar(0.f);
-			limot.m_currentLimit = m_linearLimits.m_currentLimit[i];
-			limot.m_currentPosition = m_linearLimits.m_currentLinearDiff[i];
-			limot.m_currentLimitError = m_linearLimits.m_currentLimitError[i];
-			limot.m_damping = m_linearLimits.m_damping;
-			limot.m_enableMotor = m_linearLimits.m_enableMotor[i];
-			limot.m_hiLimit = m_linearLimits.m_upperLimit[i];
-			limot.m_limitSoftness = m_linearLimits.m_limitSoftness;
-			limot.m_loLimit = m_linearLimits.m_lowerLimit[i];
-			limot.m_maxLimitForce = btScalar(0.f);
-			limot.m_maxMotorForce = m_linearLimits.m_maxMotorForce[i];
-			limot.m_targetVelocity = m_linearLimits.m_targetVelocity[i];
-			btVector3 axis = m_calculatedTransformA.getBasis().getColumn(i);
-			int flags = m_flags >> (i * BT_6DOF_FLAGS_AXIS_SHIFT);
-			limot.m_normalCFM = (flags & BT_6DOF_FLAGS_CFM_NORM) ? m_linearLimits.m_normalCFM[i] : info->cfm[0];
-			limot.m_stopCFM = (flags & BT_6DOF_FLAGS_CFM_STOP) ? m_linearLimits.m_stopCFM[i] : info->cfm[0];
-			limot.m_stopERP = (flags & BT_6DOF_FLAGS_ERP_STOP) ? m_linearLimits.m_stopERP[i] : info->erp;
-			if (m_useOffsetForConstraintFrame)
-			{
-				int indx1 = (i + 1) % 3;
-				int indx2 = (i + 2) % 3;
-				int rotAllowed = 1;  // rotations around orthos to current axis
-				if (m_angularLimits[indx1].m_currentLimit && m_angularLimits[indx2].m_currentLimit)
-				{
-					rotAllowed = 0;
-				}
-				row += get_limit_motor_info2(&limot, transA, transB, linVelA, linVelB, angVelA, angVelB, info, row, axis, 0, rotAllowed);
-			}
-			else
-			{
-				row += get_limit_motor_info2(&limot, transA, transB, linVelA, linVelB, angVelA, angVelB, info, row, axis, 0);
-			}
-		}
-	}
-	return row;
-}
-
-int btGeneric6DofConstraint::setAngularLimits(btConstraintInfo2* info, int row_offset, const btTransform& transA, const btTransform& transB, const btVector3& linVelA, const btVector3& linVelB, const btVector3& angVelA, const btVector3& angVelB)
-{
-	btGeneric6DofConstraint* d6constraint = this;
-	int row = row_offset;
-	//solve angular limits
-	for (int i = 0; i < 3; i++)
-	{
-		if (d6constraint->getRotationalLimitMotor(i)->needApplyTorques())
-		{
-			btVector3 axis = d6constraint->getAxis(i);
-			int flags = m_flags >> ((i + 3) * BT_6DOF_FLAGS_AXIS_SHIFT);
-			if (!(flags & BT_6DOF_FLAGS_CFM_NORM))
-			{
-				m_angularLimits[i].m_normalCFM = info->cfm[0];
-			}
-			if (!(flags & BT_6DOF_FLAGS_CFM_STOP))
-			{
-				m_angularLimits[i].m_stopCFM = info->cfm[0];
-			}
-			if (!(flags & BT_6DOF_FLAGS_ERP_STOP))
-			{
-				m_angularLimits[i].m_stopERP = info->erp;
-			}
-			row += get_limit_motor_info2(d6constraint->getRotationalLimitMotor(i),
-										 transA, transB, linVelA, linVelB, angVelA, angVelB, info, row, axis, 1);
-		}
-	}
-
-	return row;
-}
-
-void btGeneric6DofConstraint::updateRHS(btScalar timeStep)
-{
-	(void)timeStep;
-}
-
-void btGeneric6DofConstraint::setFrames(const btTransform& frameA, const btTransform& frameB)
-{
-	m_frameInA = frameA;
-	m_frameInB = frameB;
-	buildJacobian();
-	calculateTransforms();
-}
-
-btVector3 btGeneric6DofConstraint::getAxis(int axis_index) const
-{
-	return m_calculatedAxis[axis_index];
-}
-
-btScalar btGeneric6DofConstraint::getRelativePivotPosition(int axisIndex) const
-{
-	return m_calculatedLinearDiff[axisIndex];
-}
-
-btScalar btGeneric6DofConstraint::getAngle(int axisIndex) const
-{
-	return m_calculatedAxisAngleDiff[axisIndex];
-}
-
-void btGeneric6DofConstraint::calcAnchorPos(void)
-{
-	btScalar imA = m_rbA.getInvMass();
-	btScalar imB = m_rbB.getInvMass();
-	btScalar weight;
-	if (imB == btScalar(0.0))
-	{
-		weight = btScalar(1.0);
-	}
-	else
-	{
-		weight = imA / (imA + imB);
-	}
-	const btVector3& pA = m_calculatedTransformA.getOrigin();
-	const btVector3& pB = m_calculatedTransformB.getOrigin();
-	m_AnchorPos = pA * weight + pB * (btScalar(1.0) - weight);
-	return;
-}
-
-void btGeneric6DofConstraint::calculateLinearInfo()
-{
-	m_calculatedLinearDiff = m_calculatedTransformB.getOrigin() - m_calculatedTransformA.getOrigin();
-	m_calculatedLinearDiff = m_calculatedTransformA.getBasis().inverse() * m_calculatedLinearDiff;
-	for (int i = 0; i < 3; i++)
-	{
-		m_linearLimits.m_currentLinearDiff[i] = m_calculatedLinearDiff[i];
-		m_linearLimits.testLimitValue(i, m_calculatedLinearDiff[i]);
-	}
-}
-
-int btGeneric6DofConstraint::get_limit_motor_info2(
-	btRotationalLimitMotor* limot,
-	const btTransform& transA, const btTransform& transB, const btVector3& linVelA, const btVector3& linVelB, const btVector3& angVelA, const btVector3& angVelB,
-	btConstraintInfo2* info, int row, btVector3& ax1, int rotational, int rotAllowed)
-{
-	int srow = row * info->rowskip;
-	bool powered = limot->m_enableMotor;
-	int limit = limot->m_currentLimit;
-	if (powered || limit)
-	{  // if the joint is powered, or has joint limits, add in the extra row
-		btScalar* J1 = rotational ? info->m_J1angularAxis : info->m_J1linearAxis;
-		btScalar* J2 = rotational ? info->m_J2angularAxis : info->m_J2linearAxis;
-		J1[srow + 0] = ax1[0];
-		J1[srow + 1] = ax1[1];
-		J1[srow + 2] = ax1[2];
-
-		J2[srow + 0] = -ax1[0];
-		J2[srow + 1] = -ax1[1];
-		J2[srow + 2] = -ax1[2];
-
-		if ((!rotational))
-		{
-			if (m_useOffsetForConstraintFrame)
-			{
-				btVector3 tmpA, tmpB, relA, relB;
-				// get vector from bodyB to frameB in WCS
-				relB = m_calculatedTransformB.getOrigin() - transB.getOrigin();
-				// get its projection to constraint axis
-				btVector3 projB = ax1 * relB.dot(ax1);
-				// get vector directed from bodyB to constraint axis (and orthogonal to it)
-				btVector3 orthoB = relB - projB;
-				// same for bodyA
-				relA = m_calculatedTransformA.getOrigin() - transA.getOrigin();
-				btVector3 projA = ax1 * relA.dot(ax1);
-				btVector3 orthoA = relA - projA;
-				// get desired offset between frames A and B along constraint axis
-				btScalar desiredOffs = limot->m_currentPosition - limot->m_currentLimitError;
-				// desired vector from projection of center of bodyA to projection of center of bodyB to constraint axis
-				btVector3 totalDist = projA + ax1 * desiredOffs - projB;
-				// get offset vectors relA and relB
-				relA = orthoA + totalDist * m_factA;
-				relB = orthoB - totalDist * m_factB;
-				tmpA = relA.cross(ax1);
-				tmpB = relB.cross(ax1);
-				if (m_hasStaticBody && (!rotAllowed))
-				{
-					tmpA *= m_factA;
-					tmpB *= m_factB;
-				}
-				int i;
-				for (i = 0; i < 3; i++) info->m_J1angularAxis[srow + i] = tmpA[i];
-				for (i = 0; i < 3; i++) info->m_J2angularAxis[srow + i] = -tmpB[i];
-			}
-			else
-			{
-				btVector3 ltd;  // Linear Torque Decoupling vector
-				btVector3 c = m_calculatedTransformB.getOrigin() - transA.getOrigin();
-				ltd = c.cross(ax1);
-				info->m_J1angularAxis[srow + 0] = ltd[0];
-				info->m_J1angularAxis[srow + 1] = ltd[1];
-				info->m_J1angularAxis[srow + 2] = ltd[2];
-
-				c = m_calculatedTransformB.getOrigin() - transB.getOrigin();
-				ltd = -c.cross(ax1);
-				info->m_J2angularAxis[srow + 0] = ltd[0];
-				info->m_J2angularAxis[srow + 1] = ltd[1];
-				info->m_J2angularAxis[srow + 2] = ltd[2];
-			}
-		}
-		// if we're limited low and high simultaneously, the joint motor is
-		// ineffective
-		if (limit && (limot->m_loLimit == limot->m_hiLimit)) powered = false;
-		info->m_constraintError[srow] = btScalar(0.f);
-		if (powered)
-		{
-			info->cfm[srow] = limot->m_normalCFM;
-			if (!limit)
-			{
-				btScalar tag_vel = rotational ? limot->m_targetVelocity : -limot->m_targetVelocity;
-
-				btScalar mot_fact = getMotorFactor(limot->m_currentPosition,
-												   limot->m_loLimit,
-												   limot->m_hiLimit,
-												   tag_vel,
-												   info->fps * limot->m_stopERP);
-				info->m_constraintError[srow] += mot_fact * limot->m_targetVelocity;
-				info->m_lowerLimit[srow] = -limot->m_maxMotorForce / info->fps;
-				info->m_upperLimit[srow] = limot->m_maxMotorForce / info->fps;
-			}
-		}
-		if (limit)
-		{
-			btScalar k = info->fps * limot->m_stopERP;
-			if (!rotational)
-			{
-				info->m_constraintError[srow] += k * limot->m_currentLimitError;
-			}
-			else
-			{
-				info->m_constraintError[srow] += -k * limot->m_currentLimitError;
-			}
-			info->cfm[srow] = limot->m_stopCFM;
-			if (limot->m_loLimit == limot->m_hiLimit)
-			{  // limited low and high simultaneously
-				info->m_lowerLimit[srow] = -SIMD_INFINITY;
-				info->m_upperLimit[srow] = SIMD_INFINITY;
-			}
-			else
-			{
-				if (limit == 1)
-				{
-					info->m_lowerLimit[srow] = 0;
-					info->m_upperLimit[srow] = SIMD_INFINITY;
-				}
-				else
-				{
-					info->m_lowerLimit[srow] = -SIMD_INFINITY;
-					info->m_upperLimit[srow] = 0;
-				}
-				// deal with bounce
-				if (limot->m_bounce > 0)
-				{
-					// calculate joint velocity
-					btScalar vel;
-					if (rotational)
-					{
-						vel = angVelA.dot(ax1);
-						//make sure that if no body -> angVelB == zero vec
-						//                        if (body1)
-						vel -= angVelB.dot(ax1);
-					}
-					else
-					{
-						vel = linVelA.dot(ax1);
-						//make sure that if no body -> angVelB == zero vec
-						//                        if (body1)
-						vel -= linVelB.dot(ax1);
-					}
-					// only apply bounce if the velocity is incoming, and if the
-					// resulting c[] exceeds what we already have.
-					if (limit == 1)
-					{
-						if (vel < 0)
-						{
-							btScalar newc = -limot->m_bounce * vel;
-							if (newc > info->m_constraintError[srow])
-								info->m_constraintError[srow] = newc;
-						}
-					}
-					else
-					{
-						if (vel > 0)
-						{
-							btScalar newc = -limot->m_bounce * vel;
-							if (newc < info->m_constraintError[srow])
-								info->m_constraintError[srow] = newc;
-						}
-					}
-				}
-			}
-		}
-		return 1;
-	}
-	else
-		return 0;
-}
-
-///override the default global value of a parameter (such as ERP or CFM), optionally provide the axis (0..5).
-///If no axis is provided, it uses the default axis for this constraint.
-void btGeneric6DofConstraint::setParam(int num, btScalar value, int axis)
-{
-	if ((axis >= 0) && (axis < 3))
-	{
-		switch (num)
-		{
-			case BT_CONSTRAINT_STOP_ERP:
-				m_linearLimits.m_stopERP[axis] = value;
-				m_flags |= BT_6DOF_FLAGS_ERP_STOP << (axis * BT_6DOF_FLAGS_AXIS_SHIFT);
-				break;
-			case BT_CONSTRAINT_STOP_CFM:
-				m_linearLimits.m_stopCFM[axis] = value;
-				m_flags |= BT_6DOF_FLAGS_CFM_STOP << (axis * BT_6DOF_FLAGS_AXIS_SHIFT);
-				break;
-			case BT_CONSTRAINT_CFM:
-				m_linearLimits.m_normalCFM[axis] = value;
-				m_flags |= BT_6DOF_FLAGS_CFM_NORM << (axis * BT_6DOF_FLAGS_AXIS_SHIFT);
-				break;
-			default:
-				btAssertConstrParams(0);
-		}
-	}
-	else if ((axis >= 3) && (axis < 6))
-	{
-		switch (num)
-		{
-			case BT_CONSTRAINT_STOP_ERP:
-				m_angularLimits[axis - 3].m_stopERP = value;
-				m_flags |= BT_6DOF_FLAGS_ERP_STOP << (axis * BT_6DOF_FLAGS_AXIS_SHIFT);
-				break;
-			case BT_CONSTRAINT_STOP_CFM:
-				m_angularLimits[axis - 3].m_stopCFM = value;
-				m_flags |= BT_6DOF_FLAGS_CFM_STOP << (axis * BT_6DOF_FLAGS_AXIS_SHIFT);
-				break;
-			case BT_CONSTRAINT_CFM:
-				m_angularLimits[axis - 3].m_normalCFM = value;
-				m_flags |= BT_6DOF_FLAGS_CFM_NORM << (axis * BT_6DOF_FLAGS_AXIS_SHIFT);
-				break;
-			default:
-				btAssertConstrParams(0);
-		}
-	}
-	else
-	{
-		btAssertConstrParams(0);
-	}
-}
-
-///return the local value of parameter
-btScalar btGeneric6DofConstraint::getParam(int num, int axis) const
-{
-	btScalar retVal = 0;
-	if ((axis >= 0) && (axis < 3))
-	{
-		switch (num)
-		{
-			case BT_CONSTRAINT_STOP_ERP:
-				btAssertConstrParams(m_flags & (BT_6DOF_FLAGS_ERP_STOP << (axis * BT_6DOF_FLAGS_AXIS_SHIFT)));
-				retVal = m_linearLimits.m_stopERP[axis];
-				break;
-			case BT_CONSTRAINT_STOP_CFM:
-				btAssertConstrParams(m_flags & (BT_6DOF_FLAGS_CFM_STOP << (axis * BT_6DOF_FLAGS_AXIS_SHIFT)));
-				retVal = m_linearLimits.m_stopCFM[axis];
-				break;
-			case BT_CONSTRAINT_CFM:
-				btAssertConstrParams(m_flags & (BT_6DOF_FLAGS_CFM_NORM << (axis * BT_6DOF_FLAGS_AXIS_SHIFT)));
-				retVal = m_linearLimits.m_normalCFM[axis];
-				break;
-			default:
-				btAssertConstrParams(0);
-		}
-	}
-	else if ((axis >= 3) && (axis < 6))
-	{
-		switch (num)
-		{
-			case BT_CONSTRAINT_STOP_ERP:
-				btAssertConstrParams(m_flags & (BT_6DOF_FLAGS_ERP_STOP << (axis * BT_6DOF_FLAGS_AXIS_SHIFT)));
-				retVal = m_angularLimits[axis - 3].m_stopERP;
-				break;
-			case BT_CONSTRAINT_STOP_CFM:
-				btAssertConstrParams(m_flags & (BT_6DOF_FLAGS_CFM_STOP << (axis * BT_6DOF_FLAGS_AXIS_SHIFT)));
-				retVal = m_angularLimits[axis - 3].m_stopCFM;
-				break;
-			case BT_CONSTRAINT_CFM:
-				btAssertConstrParams(m_flags & (BT_6DOF_FLAGS_CFM_NORM << (axis * BT_6DOF_FLAGS_AXIS_SHIFT)));
-				retVal = m_angularLimits[axis - 3].m_normalCFM;
-				break;
-			default:
-				btAssertConstrParams(0);
-		}
-	}
-	else
-	{
-		btAssertConstrParams(0);
-	}
-	return retVal;
-}
-
-void btGeneric6DofConstraint::setAxis(const btVector3& axis1, const btVector3& axis2)
-{
-	btVector3 zAxis = axis1.normalized();
-	btVector3 yAxis = axis2.normalized();
-	btVector3 xAxis = yAxis.cross(zAxis);  // we want right coordinate system
-
-	btTransform frameInW;
-	frameInW.setIdentity();
-	frameInW.getBasis().setValue(xAxis[0], yAxis[0], zAxis[0],
-								 xAxis[1], yAxis[1], zAxis[1],
-								 xAxis[2], yAxis[2], zAxis[2]);
-
-	// now get constraint frame in local coordinate systems
-	m_frameInA = m_rbA.getCenterOfMassTransform().inverse() * frameInW;
-	m_frameInB = m_rbB.getCenterOfMassTransform().inverse() * frameInW;
-
-	calculateTransforms();
-}